bug: install with codecompanion does not add curly braces

[franco-ruggeri]

From CodeCompanion version 17.5.0, tools require curly braces. See here.

However, MCPHub does not insert curly braces during the installations with CodeCompanion.

Steps:

1. Open MCPHub: :MCPHub
2. Try to install an MCP server with CodeCompanion
3. Note that the tools are wrongly without curly braces (e.g., @files instead of @{files}

Example:

[ravitemer]

@franco-ruggeri Thanks for raising this.

We will be moving to new Marketplace #184 soon! The AI install feature will be removed. However, it makes sense to fix it 0df8b0e in the meanwhile. Thank you.